The very old screens that have a round plug that looks similar to a PS2 port but with more pins was the old way to hook up an iPod (this the old click wheel) using a 30 pin to that round port adapter).

AFAIK, Apple never ended up selling the cable so you had to make your own and it didn't work very well at all.

https://www.reddit.com/r/aviation/co...or_on_a_plane/

I am sure once it is reintroduced it will have a much more elegant user interface